RoundQCF(d,u,v,quiet) returns the "round" continued fraction expansion of (u+sqrt(d))/v, where u and d are Gaussian integers and v is an ordinary positive integer. It also
returns the round rational convergents
as well as the coefficients u(k) and
v(k) of the recipricols of the remainders x(k) = (u(k)+sqrt(d))/v(k).